#69 Add support of OSD_EBCDIC_DF04_1

[Jean-frederic Clere]

The patch allows to parse a document encoded in EBCDIC.
OSD_EBCDIC_DF04_1 is an EBCDIC charset used on BS2000
mainframe and registered at IANA (See
http://www.iana.org/assignments/character-sets\).
I am using the patch in APR (Apache Portable Rutime).
The patch could be easly adapted to other EBCDIC
encoding by changing the include files
map_osd_ebcdic_df04_1.h and osd_ebcdic_df04_1.h

[Jean-frederic Clere]

Patch against APR version of expat

[Karl Waclawek]

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Thank you for your patch!

For now we will leave it as a standalone patch,
as we have not yet determined in which way support
for additional encodings should be added to Expat.